Wow, I've just read through all 32 pages, and have to say......what a neat thread! I think maybe I have to start making yogurt again. I used to make it regularly, but have been slacking off as DH is not fond of yogurt. He had major health issues for most of last year, so a lot of the things I used to do, if not directly related to his health, got put on the back burner.
A couple of comments which somebody might find helpful:
1) I have used a yogurt maker, and also the "cooler as incubator", and would definitely say don't waste your money on the y. maker. The cooler does a super job, and is cheaper.
2) I haven't always lived in soggy Oregon, and a holdover from periodically drought challenged California is to try to avoid wasting water. You don't have to fill the cooler with hot water, and then strain your back pouring it out. Just fill a jar or two or three with hot water, pop them in the cooler (don't wrap in towels), close the lid, and by the time the milk is ready to go in the cooler will be nice and warm. In fact, I keep a jar in there all the time (except when I need it for a picnic LOL), and just reheat the same water in the microwave.
3) I don't wrap the incubating jars either; I check after 4 hours or so - if the yogurt is done, fine and dandy. If not I re-heat the water in the microwave, and then check it every couple of hours - or, sometimes, leave it overnight. As many of you have found it will probably be more tart, but still good.
4) I use unbleached muslin from the fabric store to drain the yogurt. Really cheap, and can be re-used (after washing of course), which is difficult with cheesecloth. (When the sewing machine is out I'll hem the squares, otherwise not. They last longer hemmed)
5) A good drainer is a clean 1 quart yogurt container (which you got as your starter yogurt) - put a large square of muslin over the top, secure with a rubber band, pour in up to about 2 cups of yogurt, cover with the lid, and place in the 'fridge. By morning you'll have yogurt cheese.
6) The whey can be used in baking, used to water plants (not houseplants, as it seems to attract little flying beasties), or given to the chickens.
7) Sour cream can be made in exactly the same way as yogurt, even using the same culture, by starting with half and half or cream.
Now I have to find a source for good milk, and try my hand at mozzerella. Thanks MissPrissy for starting this discussion.